They that have no other meat, Bread and butter are glad to eat.

The proverb says that people can be glad of a plain meal when no other food is available. Their appreciation comes from having something to eat, not from considering it a feast.

More broadly, a modest option may feel worthwhile when the alternatives are absent. The proverb emphasizes how circumstances shape what people are willing to accept.

Use it when someone welcomes a basic meal or another modest option because nothing else is available. It suits a situation where limited choice makes acceptance understandable, without implying that the person would always prefer that option.